Escalator truss
  • August 17, 2020
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Article 17- Escalator Supporting Structure (Truss)

Escalator Truss

The escalator supporting structure which is called “Escalator Truss” is the main chassis where all the machineries are installed on. The escalator truss is composed of three main sections (Upper, Middle, Lower) and normally the upper and lower sections are fixed and to provide variable height, the middle section can be altered.

There are two truss support angles at the top and bottom ends of the escalator truss which are placed on the main construction beams of the building. The support angles are not fixed (not welded, not screwed down, etc.) and are only held down by their own weight. Under the support angles there is a layer of high density rubber which prevents truss vibration.

The escalator truss material is from different steel alloys and shapes (Rectangle, Angle, and Channel) and combinations thereof in different sizes. A steel sheet is installed on the underside of the truss which is called “Soffit” of 5 millimeter thickness.

The escalator truss must be designed in such a way that there is no oscillation or distortion in the structure and for this purpose, we must use jig-welding which give us high quality joints by keeping the parts immoveable. The welding must be continuous in all planes.

For the truss coating, paint is used for the indoor escalators and for a longer life time, hot-dip galvanized according to BS 729 (ISO1461) with a minimum thickness of 85µm is used for semi outdoor, fully outdoor and heavy duty escalators.

Coating

Single Coating

Double Coating

Special Paint

Hot-Dip Galvanized

Approximate Life time (Years)

5

15

20

30


The truss of the escalator must support a dead weight as well as structural rated load of 5000 N/m2 in compliance with EN 1993-1-1:2005 and the maximum deflection will be 1/750 of the horizontal length of the two construction beams. In the case the horizontal length of the truss is too long and causes more deflection than authorized, we have to use middle support(s).

In order to assist with transportation of long escalators the truss can be divided into two or more sub-sections. To rejoin the sub-sections at the time of installation we must use socket-headed bolts where their location was assigned and pre-drilled on jointing plates in the factory.

In order to move and rejoin escalators there are some plates with holes, welded to the corners of the truss to use for lifting which are called “Lifting Eye”. If the truss is divided into sub-sections they also must have lifting eyes on each corner. 

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